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But one man decided to buy his future wife's ring at a local store for the personal service

It's what so many girls and women dream of: That one special man, down on one knee, asking for her hand in marriage, holding out a sparkling engagement ring.

But what if he bought the ring while he was picking up a jug of milk, a tub of butter and a jumbo pack of toilet paper? Would it take away some of the romance if he bought it at a warehouse membership store?

OK, now take a closer look at the ring, because it could be worth $1 million. Are you breathless and giddy yet?

Well, the groom-to-be probably wouldn't pack up the ring with his groceries because Costco is selling the 6.2-carat one-of-a-kind solitaire diamond ring, valued at $1,496,255 by the International Gemological Institute, only to members online for $1 million.

But would the blushing bride-to-be showing off her super-sized bling face a potentially embarrassing question: "Where did he buy it?"

There should be no stigma there, says HLN money expert Clark Howard, because "nobody asks a woman where her diamond came from."

Howard bought his wife's engagement ring at a membership store "because it was a deal, and she loved it."

"The best part about buying a diamond from Costco is the right to return for a full refund for any reason at any time," Clark said. "That is unheard of in the jewelry business."

Costco officials say they've seen a rise in jewelry sales since their e-commerce site went live five years ago. Their biggest sale so far is an engagement ring that sold for close to $500,000.